Optical instrument



FIG. 1 is a perspective view from the left side of an embodiment of an optical instrument according to the invention.

FIG. 2 is left side elevational view of the embodiment.

FIG. 3 is a right side elevational view of the embodiment.

FIG. 4 is a front elevational view of the embodiment.

FIG. 5 is a rear elevational view of the embodiment.

FIG. 6 is a top plan view of the embodiment; and,

FIG. 7 is a bottom plan view of the embodiment. 

The ornamental design for an optical instrument, as shown and described. 